261013515 has 32 divisors (see below), whose sum is σ = 478033920. Its totient is φ = 119132544.

The previous prime is 261013481. The next prime is 261013523. The reversal of 261013515 is 515310162.

It is not a de Polignac number, because 261013515 - 2¹³ = 261005323 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 82126 + ... + 85244.

It is an arithmetic number, because the mean of its divisors is an integer number (14938560).

Almost surely, 2^261013515 is an apocalyptic number.

261013515 is a deficient number, since it is larger than the sum of its proper divisors (217020405).

261013515 is a wasteful number, since it uses less digits than its factorization.

261013515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3931.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 261013515 is about 16155.9126947381. The cubic root of 261013515 is about 639.0786833000.

Adding to 261013515 its reverse (515310162), we get a palindrome (776323677).

The spelling of 261013515 in words is "two hundred sixty-one million, thirteen thousand, five hundred fifteen".